Iron-base alloys



Feb. 5, 1963 A. T. CAPE ETAL 3,076,704

TRON-BASE ALLOYS Filed March 14, 1961 IN V EN TORS.

ARTHUR T. CAPE Y HERBERT CLARKE ATTORNEYS United States Patent 3,076,704 IRON-BASE ALLOYS Arthur T. Cape, Monterey, Calif., and Herbert Clarke, Hillsdale, N.J., assignors to Coast Metals, Inc., Little Ferry, N.J., a corporation of Delaware Filed Mar. 14, 1961, Ser. No. 95,608 4 Claims. (Cl. 75-128) This invention relates generally to iron-base alloys, but has reference more particularly to an iron-base alloy which is especially useful for manufacture into roller mill guides for steel mills.

Roller mill guides for steel mills, of which a typical example is illustrated in the accompanying drawing, in which FIG. 1 is an end elevational view of such a guide, and FIG. 2 is a cross-sectional view, taken on the line 2-2 of FIG. 1, have portions or areas which are of varying cross-section, so that it is important that the material which is used for manufacture into such guides have excellent toughness, heat resistance, resistance to impact, and relative freedom from susceptibility to heat checking, i.e., the development of fine cracks on the surface of the guides.

We have found that an iron-base alloy which has all of these properties has a composition which falls within the following ranges:

Percent Carbon 1 to 3 Chromium 15 to 20 Nickel 4 to 8 Cobalt I 28 to 35 Tungsten Up to 3 Molybdenum Up to 3 Iron Balance 2 are incorporated in the alloy increase its heat-resistance, at the expense of some resistance to impact, and the net result is an alloy which is peculiarly satisfactory for manufacture into roller guides.

The alloy is more austenitic than alloys previously used for this purpose, and roller guides made from the alloy have virtually twice the life of guides presently made from such previously used alloys.

The alloy may contain one or more residual or trace elements, such as silicon, manganese, sulphur, phosphorus, etc., but the total of such elements should not exceed 3%. It is to be understood, therefore, that the phrase substantially all iron, as used in the claims, is to be construed as inclusive of such a combined total of residual or trace elements.

It will be understood that various changes in the aforesaid alloys may be made, within the scope of the appended claims.

Having thus described our invention, we claim:

1. An alloy which is especially useful for manufacture into roller mill guides for steel mills, said alloy consisting of from 1 to 3% carbon, 15 to 20% chromium, 4- to 8% nickel, 28 to 35% cobalt, tungsten in appreciable amounts up to 3%, molybdenum in appreciable amounts up to 3%, and the balance substantially all iron.

2. An alloy which is especially useful for manufacture into roller mill guides for steel mills, said alloy consisting of about 2% carbon, about 18% chromium, about 6% nickel, about 30% cobalt, about 2 /z% tungsten, about 2 /2% molybdenum, and about 39% iron.

3. A roller mil-l guide for steel mills, said guide comprising an alloy consisting of from- 1 to 3% carbon, 15 to 20% chromium, 4 to 8% nickel, 28 to 35% cobalt, tungsten and molybdenum each in an appreciable amount up to 3%, and the balance substantially all iron.

4. A roller mill guide for steel mills, said guide comprising an alloy consisting of about 2% carbon, about 18% chromium, about 6% nickel, about 30% cobalt, about 2 /2% tungsten, about 2 /2% molybdenum, and about 39% iron.

References Cited in the file of this patent FOREIGN PATENTS 716,277 France Dec. 17, 1931 

1. AN ALLOY WHICH IS ESPECIALLY USEFUL FOR MANUFACTURE INTO ROLLER MILL GUIDES FOR STEEL MILLS, SAID ALLOY CONSISTING OF FROM 1 TO 3% CCARBON, 15 TO 20% CHROMIUM, 4 TO 8% NICKEL, 28 TO 35% COBALT, TUNGSTEN IN APPRECIABLE AMOUNTS UP TO 3%, MOLYBDENUM IN APPRECIABLE AMOUNTS UP TO 3%, AND THE BALANCE SUBSTANTIALLY ALL IRON. 